IAC-02-r4.08 - PowerPoint PPT Presentation

1 / 14
About This Presentation
Title:

IAC-02-r4.08

Description:

Laser WPT to Photo-Voltaics on the moon or Mars. MSC 1B: Lunar Polar Science Applications ... Good for Rocket Propellants. Summary ... – PowerPoint PPT presentation

Number of Views:173
Avg rating:3.0/5.0
Slides: 15
Provided by: markwilli
Category:
Tags: iac | insolation | moon | rocket

less

Transcript and Presenter's Notes

Title: IAC-02-r4.08


1
Wireless Power Transmission Optionsfor Space
Solar Power
  • IAC-02-r4.08
  • Henley, M.W. (1), Potter, S. D. (1), Howell, J.
    (2), and Mankins, J.C. (3)
  • (1) The Boeing Company, (2) NASA Marshall Space
    Flight Center, (3) NASA Headquarters
  • World Space Congress
  • Houston, Texas
  • October 17, 2002

2
Wireless Power Transmission Optionsfor Space
Solar Power
  • Far Term Space Systems to beam power to Earth
  • Radio-Wave WPT System
  • Light-Wave Systems
  • Near term Technology Flight Demonstrations
  • Model System Concept 1A 100 kWe satellite
  • Model System Concept 1B 10 kWe lunar system

3
Global Power Consumption
Remote Sensing of Current Global Power
ConsumptionA Composite Satellite Photograph of
the Earth at Night
4
Initial Photovoltaic / Microwave SPSGEO Sun
Tower Conceptual Design
  • Sun-Tower Design based on NASA Fresh Look Study
  • Transmitter Diameter 500 meters
  • Vertical Backbone Length 15.3 km (gravity
    gradient)
  • Identical Satellite Elements 355 segments
    (solar arrays)
  • Autonomous Segment Ops 1) Solar Electric
    Propulsion from Low Earth Orbit2) System
    Assembly in Gesostationary orbit
  • Large Rectenna Receivers Power production on
    Earth

5
Photovoltaic / Laser-Photovoltaic SPSGEO Sun
Tower-Like Concept
  • Solar Panel Segment Dimensions 260 m x 36 m

Lasers and Optics
8 Ion Thrusters
PMAD
Avionics
  • Full Sun Tower Portion
  • 1530 modules
  • 55 km long
  • Backbone can be eliminated

Deployable Radiator
Multiple beams
6
Synergy Between Sunlight and Laser-PV WPTfor
Terrestrial Photo-Voltaic Power Production
  • Large photo-voltaic (PV) power plants in Earths
    major deserts (Mojave, Sahara, Gobi, etc.)
    receive convert light from 2 sources
  • 1) Directly from the Sun, and
  • 2) Via WPT from SSP systems
  • Laser light is transmitted and converted more
    efficiently than sun-light
  • Wavelength is selected for good atmospheric
    transmissivity
  • Efficient Light Emitting Diode wavelengths match
    common PV band-gaps
  • Gravity gradient-stabilized SPSs are in peak
    insolation at 6 AM and 6 PM, with shadowing or
    cosine loss at mid-day and midnight
  • Heavy, complex gimbaled arrays add little extra
    power at these times
  • Both sides of rigid (not gimbaled) solar arrays
    can be light-sensitive
  • Back-side produces less power due to occlusion by
    wires
  • Translucent substrate (e.g., Kapton) also reduces
    back-side power levels
  • Even gimbaled arrays suffer a loss of power
    around noon and midnight
  • The combination of ambient sunlight plus laser
    illumination combines, at the terrestrial PV
    array, to match the daily electricity demand
    pattern

7
Sunlight Laser-PV WPT Power
RequirementPhoto-Voltaic (PV) Power Station
Receives Both
Total Power at PV Receiver
PV Power from WPT-Light
PV Power from Sunlight
1.2
1.0
0.8


Normalized Power / Area
0.6
0.4
0.2
0.0
6
12
18
24/0
6
12
18
24
0
6
12
18
24/0
Time (Hours)
Time (Hours)
Time (Hours)
Electrical Power Demand
Normalized Output from SPS
(Non-Tracking Arrays)
Normalized Output from Sun
Normalized Total Output
Typical Electricity Demand
14
8
WPT Wavelength Trade for SSP
9
MSC-1A Near Term Demonstration100 kWe Power
Plug Satellite
  • Power System derived from existing ISS IEA
    (Integrated Energy Assembly)
  • IEA is successfully deployed in orbit now
  • IEA includes energy storage (batteries)
  • Current ISS array pair produces 61.5 kWe
  • Advanced PV cells can double IEA power
  • 120 kWe with derivative array
  • MSC-1 demonstrates solar-powered WPT
  • Efficient power generation
  • Light Emitting Diodes (LEDs) achieve gt30
    conversion efficiency
  • 36 kW transmitted in light beam
  • Effective heat dissipation via IEA radiators
  • Accurate pointing of beam via reflector

70.8 m
11.7 m
10
ISS with IEA Solar Panels Fully Deployed Current
flight experience with large IEA reduces risk for
near-term derivative applications
11
MSC-1A Lunar and Mars Power (LAMP)
ApplicationLaser WPT to Photo-Voltaics on the
moon or Mars
12
MSC 1B Lunar Polar Science Applications
  • Technology for Laser-Photo-Voltaic Wireless Power
    Transmission (Laser-PV WPT) is being developed
    for lunar polar applications by Boeing and NASA
    Marshall Space Flight Center
  • A lunar polar mission could demonstrate and
    validate Laser-PV WPT and other SSP technologies,
    while enabling access to cold, permanently
    shadowed craters that are believed to contain ice
  • Craters may hold frozen water and other volatiles
    deposited over billions of years, recording prior
    impact events on the moon ( Earth)
  • A photo-voltaic-powered rover could use sunlight,
    when available, and laser light, when required,
    to explore a large area of polar terrain
  • The National Research Council recently found that
    a mission to the moons South Pole-Aitkin Basin
    should be a high priority for Space Science
  • See paper IAC-02-r4.04, Space Solar Power
    Technology Demonstration for Lunar Polar
    Applications, for further details

13
North Pole (SEE BELOW)
Moons Orbit
  • Sun Rays are Horizontal
  • at North South Poles
  • NEVER shine into Craters
  • ALWAYS shine on Mountain

South Pole (SEE BELOW)
Solar Power Generation on Mountaintop
Direct Communication Link
Wireless Power Transmission for Rover
Operations in Shadowed Craters
Space Solar Power Technology Demonstration For
Lunar Polar Applications
  • POSSIBLE ICE DEPOSITS
  • Craters are COLD -300F (-200C)
  • Frost/Snow after Lunar Impacts
  • Good for Future Human Uses
  • Good for Rocket Propellants

14
Summary
  • Farther-term micro-wave WPT options are
    efficient, and can beam power through clouds /
    light rain, but require large sizes for long
    distance WPT and a specialized receiver
    (rectenna).
  • Nearer-term Laser-Photovoltaic WPT options are
    less efficient, but allow synergistic use of the
    same photo-voltaic receiver for both terrestrial
    solar power and SSP.
  • The smaller aperture size also allows smaller
    (lower cost) initial systems.
  • Laser-Photovoltaic WPT systems open new SSP
    architecture options.
  • Gravity gradient-stabilized Sun Tower SSP
    satellites may make more sense for laser systems
    than than for microwave systems, because the
    receiver also converts sunlight into electricity,
    to correct for the cosine loss otherwise observed
    in power production at mid-day.
  • Technology flight demonstrations can enable
    advanced space science and exploration in the
    near term.
  • Power Plug or LAMP spacecraft and Lunar Polar
    Solar Power outpost advance technology for
    far-term commercial SSP systems, while providing
    significant value for near-term applications.
Write a Comment
User Comments (0)
About PowerShow.com